Botha becomes the latest in an ever-growing list of South Africans who have committed to a move to Europe in the coming months.

The 27-year-old Botha, who stands 2.05m and weighs 124kg, will initially join the Exiles on a six-month contract acting as Rugby World Cup cover.

Following a spell with Kubota Spears in Japan, he will then re-join London Irish in June 2020 in preparation for the 2020/21 campaign at the club’s Brentford Community Stadium.

Botha, who has made 64 appearances in Super Rugby, has captained the Sharks.

“Ruan being available during the Rugby World Cup period is a major boost to us. He has a lot of top-class rugby experience and will also bring a lot more to the squad in terms of his leadership qualities,” Declan Kidney, London Irish director of rugby, said.

“London Irish is entering an exciting period in its history and I am immensely proud to be joining at such an important time as they return to the Premiership. I look forward to meeting up with my teammates for pre-season,” Botha added.

The Sharks have been hit by departures from the union by flyhalf Robert du Preez and hooker Akker van der Merwe, while the Du Preez twins, Jean-Luc and Dan, will also enjoy stints at the Sale Sharks in 2020.